Development of symbiotic interactions in the faba bean (Vicia faba L.) roots
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Kuupäev
2019
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Kirjastaja
Abstrakt
Double-inoculation of faba bean (Vicia faba L.) seeds before sowing with rhizobium
bacteria and mycorrhizal fungi is a known agronomic practice. It improves symbiotic nitrogen
fixation and enhances legume supply with mineral elements and water. Effective symbiosis
makes it possible to replace some of the required mineral fertilizer needed for plant growth with
symbiotically fixed. This will ensure more environmentally friendly agricultural production. The
formation of an effective symbiosis depends on a number of biotic and abiotic factors affecting
the biochemical signals released by the partners. The biochemical mediator for symbiosis
formation is flavonoids. The aim of this experiment was to test the effects of rhizobial and
mycorrhizal inocula on symbiosis formation under different temperatures. Beans are an important
source of protein for animal feed and human consumption. Four cultivars of faba beans were used
- two V. faba var. minor Beck. -‘Fuego’ and ‘Lielplatone’, and two V. faba var. major Harz. -
‘Bartek’ and ‘Karmazyn’. The combination of microorganisms for seed inoculation influenced
the frequency of root mycorrhization and abundance of arbuscules. The content of flavonoids in
seed exudates correlated (r = 0.93) with germination temperatures. The use of mycorrhizal fungi
alone or in combination with rhizobia reduced the amount of flavonoids in the bean seed exudate.
In the pot experiment the amount and size of nodules significantly differed between cultivars.
Use of mycorrhizal preparation mitigated the effect of inadequate germination temperature.
Higher degree of mycorrhization and more intense formation of arbusculs formation was
observed in the bean roots grown in vegetation pots in comparison with field ones. Local bred
‘Lielplatone’ had significantly better compatibility with microsymbionts in local agroclimatic
conditions.
Kirjeldus
Article
Märksõnad
flavonoids, rhizobia, mycorrhiza, nodule, temperature, faba beans, articles